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Drop ranges from 111 meters down to zero meters
lower estimate would be to use a linear dispersion in the drop.
ie... 132,000,000,000 kg / 111 = share at each meter of drop or just switch to a calculus based slope....
std grav is: 9.80665 m/s2,
do the math...
it's immense.

#9 Glenmore, subbed for a science class yesterday and this question came up. Desert soil absorbs water SLOWLY compared to places that are always wet which is the reason that flash flooding is a much bigger problem in arid environments.

#16 It's about 9 FatBoy Atomic Bombs (A "Fat Man" bomb was dropped over Nagasaki, Japan, on Aug. 9, 1945) so in other words approximately a 180 kiloton atomic bomb (big for an a-bomb small for a n-bomb) But that's just the energy at break point. That mass of water is going to roll with all that force creating canyons all the way to the Med. In the Med it would likely make a tidal wave that would slosh all over.
It would take out everything near the Nile and gouge a canyon right through the delta. Think what channelizing the Mississippi did to it's delta. The Egyptian delta would likely start disappearing. There would be a huge dead zone in Med that the Nile would plow right into for centuries. (think Louisiana delta) Perhaps the Suez would become a strait instead of a canal...

#19 The larger a temporary lake is, the more extreme the likely breakout will be. One of the largest known to have occurred in recent geological history was the collapse, around 15,000 years ago, of the ancient Lake Bonneville which was filled with meltwater from the last ice age and covered large areas of Utah, Idaho and Nevada. Erosion broke through the lake shore's lowest point, the Red Rock Pass in Idaho, releasing as much as 1,000 mile³ (4,000 km³) of water within a period estimated to have lasted only two weeks. The energies released by the outburst were capable not just of stripping surface features, but gouging out bedrock to a depth of many feet. It drastically reshaped the landscape downstream, carving out many of the features of the Snake River and its surrounding area. Glacial Lake Missoula also had lake breakouts, due to breaking of ice dams, see Missoula Floods. These lake breakouts caused extensive erosion throughout eastern Washington. It has been suggested that gigantic breakouts from underground lakes may have been responsible for carving some of the canyons of Mars.

IMO it is likely will Morsi/MusBro-led Egypt will pressure fellow Arab League member Baby Assad in Syria, + the Hezzies in Lebanon, etal. to attack Israel from the North - IIRC DURING 1973'S YOM KIPPUR WAR ISRAEL'S IDF JUST BARELY WON A HARD-FOUGHT ARMOR BATTLE AGZ WAVE AFTER WAVE OF SYRIAN TANKS, PLUS SYRIAN GROUND TROOPS EQUIPPED WID SOVIET-SUPPLIED ATGMS.

I find it ironic that the greatest single threat to Baby Assad's rule stems not from the Rebels. but from post-Mubarak Egypt's desire to protect the Paleos + Hamas in Gaza.

#22 As the material gave way, Marsh Creek Valley, immediately downstream, was flooded from wall to wall, and the rapid discharge eroded the pass to its present level. The flood then flowed into the Snake River Plain, generally following the path of the present-day Snake River to its outlet in the Pacific Northwest.[3]

The Bonneville Flood, as it is known, was a catastrophic event. The maximum discharge was about 15 million cubic feet per second (420,000 m³/s), or about three times the average flow of the Amazon River, the world's largest river. The speed of flow was approximately 16 mph (7 m/s), and though peak flow lasted only a few days, voluminous discharges may have continued for at least a year.

#23 The Red River break was 105 meters high and Aswan is 115 so the flow should be similar to Lake Bonneville's just end much quicker than one year.
Aswan has 132Km(3) of water to let go where lake Bonneville had 4000km(3) so (132/4000)*1 year = 12 days. Max flow should be 2 weeks * (132/4000) or 1/2 day.

#24 What are the Death Toll's likely to be? Warning/reaction times? Seriously, we could be talking about 30-40million people, not to mention species of animal and the archeology lost. This seems more a last-ditch option.

#26 Actual damage might be worse than Bonneville. The area from Aswan to Cairo has a lot of fine sand that the flow would pick up. By the time the flow reached Cairo it would be akin to grinding compound that you say grind your engine's heads with... Nasty stuff. Anything in it's path would be ground fine. People, pyramids, weapons, cars, roads.... likely all the way to bedrock.

#27 There is the friction to consider as the water roars down the Nile Valley. That will slow it some. Of course, the water is going to pick up everything in its path as Water Modem points out, so that by the time it gets to Cairo it'll be the equivalent of battleship sandpaper.

#28 It looks like about 600 miles as the river flows from Aswan to Cario. At 16mph that's 600/16 or 37.5 hours. Most could walk way into the desert in that time. Average human walking speed is 4mph so 37.5 hours without sleep could take one 150 miles. But my bet is that the wavefront is only 5 to 10 miles wide at Cairo with 5 being more likely. The West side is greener on Google Maps than the East so I assume the East side is higher. Walk East 5 to 10 miles and one is probably okay.
There would be plenty of time to do that. 3 hours plus crowds. Make it 6 out of 37.5

Take food, snakebite kit and clothes plus guns and leave the rest. (Sand dunes East of town)

#30 I may need to take the last one back.
Widest part of the Amazon is 24.5 miles. At the flow we are talking about max run is 3 times Amazon flow so if it is shallow for awhile width could be 74 miles wide at 16 mph.

And I did leave out drop from Aswan to the sea...
That's 85 meters so total drop to the sea would be 115 + 85...
(mod of program and subtract for additional energy);
That makes total energy to the sea: 5.64630884565001e+17 joules
That's a lot more... 5.0e+17 more joules....
Ouch!!!